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In India coal combustion is the single largest source of emission of mercury which is a wide-spread persistent global toxicant, travelling across international borders through air and water. As a party to the Minamata convention, India aims to monitor and reduce Hg emissions and stricter norms are introduced for mercury emissions from power plants (30 μg/Nm3for flue gas in stack).This paper presents the results obtained during the experimental studies performed on mercury emissions at four coal-fired and one lignite-fired power plants in India. The mercury concentration in the feed coal varied between 0.12–0.27 mg/Kg. In the mercury mass balance, significant proportion of feed coal mercury has been found to be associated with fly ash, whereas bottom ash contained very low mercury. 80%–90% of mercury was released to air through stack gas. However, for circulating fluidised bed boiler burning lignite, about 64.8% of feed mercury was found to get captured in the fly ash and only 32.4% was released to air. The mercury emission factor was found to lie in the range of 4.7–15.7 mg/GJ. 相似文献
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Khoirakpam Kesho Singh Kula Kamal Senapati Chandan Borgohain Kanak Chandra Sarma 《环境科学学报(英文版)》2017,29(2):333-340
Chlorophenols, typically 4-chlorophenols are highly toxic and non-biodegradable organic contaminants which pose serious threat to the environment, particularly when released into aqueous medium. The removal of these pollutants by efficient method has received worldwide concern in recent past. A new Fe_3O_4–Cr_2O_3 magnetic nanocomposite was synthesized by wet chemical method under ultrasonic irradiation. Microstructure and morphology of the nanocomposite were characterized by powder X-ray diffraction(XRD),Fourier transform infrared(FT-IR), and a transmission electron microscope(TEM). Magnetic and optical properties were studied by a vibrating sample magnetometer(VSM) and an ultraviolet–visible(UV–Vis) spectrophotometer respectively. The magnetic nanocomposite(MNC) was used as photocatalyst for effective decomposition of 4-chlorophenol in water under ultraviolet(UV) irradiation. 相似文献
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Environmental Chemistry Letters - Zinc oxide (ZnO) nanoparticles are widely used in cosmetics, food packaging, drug delivery and biosensors. There is therefore a risk of toxicity for organisms,... 相似文献
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Agarwalla Hridesh Das Tarit Baran Senapati Rabinarayan Gangopadhyay Monalisa Masto Reginald E. Kumar Manish Singh Vikram 《Journal of Material Cycles and Waste Management》2023,25(5):2632-2641
Journal of Material Cycles and Waste Management - India is considered as one of the major mercury emitters of the world. Coal combustion in power plants is the foremost source of mercury emissions.... 相似文献
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Agarwalla Hridesh Senapati Rabi Narayan Das Tarit Baran 《Journal of Material Cycles and Waste Management》2022,24(6):2636-2643
Journal of Material Cycles and Waste Management - The Minamata convention addresses the issue related to mercury poisoning and aim to reduce mercury pollution, as mercury is one of the major... 相似文献
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